LÖVE

Posted: **Sun Mar 27, 2011 4:16 am**

I've been developing a game, and I have the game 'server' set up, but there's one thing I forgot : How do you use the Lua socket library. Anyone help!

Posted: **Sun Mar 27, 2011 8:00 am**

amdintel32 wrote:How do you use the Lua socket library.

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require "socket"

Also see the luasocket documentation for how to go from there.

If you still have questions, feel free to ask them here. But can you be a bit more specific about what the problem is?

Posted: **Sun Mar 27, 2011 8:32 am**

Robin wrote:
amdintel32 wrote:How do you use the Lua socket library.
Code: Select all
require "luasocket"
Also see the luasocket documentation for how to go from there.

If you still have questions, feel free to ask them here. But can you be a bit more specific about what the problem is?

Isn't it

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require 'socket'

? That's what I was told.

Posted: **Sun Mar 27, 2011 8:44 am**

D'oh. You're absolutely right. *goes on to modify his post to try and avoid further confusion*

Posted: **Sun Mar 27, 2011 8:44 am**

Phew.

Posted: **Sun Mar 27, 2011 8:47 am**

I'm using it like this:
As soon as I know I want to use a socket I'll want to call network_init with the IP and port of the server.

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function network_init(ip,port)
    TCP_sock = socket.tcp()
    TCP_sock:settimeout(7) --Wait up to 7 seconds to connect.
    if not TCP_sock:connect(ip,port) then
        error("Failed to connect =(")
    end
    TCP_sock:settimeout(0) --Don't wait on further calls (so we can use the socket for nonblocking I/O).
end

Then, every frame I'll call do_messages. flush_socket reads data from the socket, appends it to a buffer, and errors if the connection has closed. After that, I'll read messages from the buffer until I run out. My game uses an extremely primitive RPC system, so each message is a one-character message type followed by an amount of data determined by the type of message. Each message type has its own function to process the data in the message.

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local leftovers = ""

function flush_socket()
    local junk,err,data = TCP_sock:receive('*a')
    -- lol, if it returned successfully then that's bad!
    if not err then
        error("the connection closed unexpectedly")
    end
    leftovers = leftovers..data
end

local type_to_length = {G=1, H=1, N=1, P=121, O=121, I=23}

function get_message()
    if string.len(leftovers) == 0 then
        return nil
    end
    local typ = string.sub(leftovers,1,1)
    local len = type_to_length[typ]
    if len > string.len(leftovers) then
        return nil
    end
    local ret = string.sub(leftovers,2,type_to_length[typ])
    leftovers = string.sub(leftovers,type_to_length[typ]+1)
    return typ, ret
end

local process_message = {
    G=function(s) ask_for_panels("000000") end,
    H=function(s) end,
    N=function(s) error("Server rejected connection due to protocol missmatch.") end,
    P=function(s) P1.panel_buffer = P1.panel_buffer..s end,
    O=function(s) P2.panel_buffer = P2.panel_buffer..s end,
    I=function(s) P2.input_buffer = P2.input_buffer..s end}

function do_messages()
    flush_socket()
    while true do
        local typ, data = get_message()
        if typ then
            process_message[typ](data)
        else
            break
        end
    end
end

Making a call to the server is much simpler:

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TCP_sock::send(some_string)

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